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22-12-2016
Mathematics

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how many 4 digit passcodes are possible if no digits are repeated

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22-12-2016

10 numbers
4 parts

1st slot: 10 choices
2nd slot: 9 choies (1 less than 10)
3rd slot: 8 choies (1 less than 9)
4th slot: 7 choices (1 less than 8)

10*9*8*7=5040

answer is 5040 codes

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